OK, let's crack this. We're given 755 and our task is to multiply it by 343. Essentially, we'll be adding 755 to itself 343 times.
Step 1: 0 + 755 = 755
Step 2: 755 + 755 = 1510
Step 3: 1510 + 755 = 2265
Step 4: 2265 + 755 = 3020
Step 5: 3020 + 755 = 3775
Step 6: 3775 + 755 = 4530
Step 7: 4530 + 755 = 5285
Step 8: 5285 + 755 = 6040
Step 9: 6040 + 755 = 6795
Step 10: 6795 + 755 = 7550
Step 11: 7550 + 755 = 8305
Step 12: 8305 + 755 = 9060
Step 13: 9060 + 755 = 9815
Step 14: 9815 + 755 = 10570
Step 15: 10570 + 755 = 11325
Step 16: 11325 + 755 = 12080
Step 17: 12080 + 755 = 12835
Step 18: 12835 + 755 = 13590
Step 19: 13590 + 755 = 14345
Step 20: 14345 + 755 = 15100
Step 21: 15100 + 755 = 15855
Step 22: 15855 + 755 = 16610
Step 23: 16610 + 755 = 17365
Step 24: 17365 + 755 = 18120
Step 25: 18120 + 755 = 18875
Step 26: 18875 + 755 = 19630
Step 27: 19630 + 755 = 20385
Step 28: 20385 + 755 = 21140
Step 29: 21140 + 755 = 21895
Step 30: 21895 + 755 = 22650
Step 31: 22650 + 755 = 23405
Step 32: 23405 + 755 = 24160
Step 33: 24160 + 755 = 24915
Step 34: 24915 + 755 = 25670
Step 35: 25670 + 755 = 26425
Step 36: 26425 + 755 = 27180
Step 37: 27180 + 755 = 27935
Step 38: 27935 + 755 = 28690
Step 39: 28690 + 755 = 29445
Step 40: 29445 + 755 = 30200
Step 41: 30200 + 755 = 30955
Step 42: 30955 + 755 = 31710
Step 43: 31710 + 755 = 32465
Step 44: 32465 + 755 = 33220
Step 45: 33220 + 755 = 33975
Step 46: 33975 + 755 = 34730
Step 47: 34730 + 755 = 35485
Step 48: 35485 + 755 = 36240
Step 49: 36240 + 755 = 36995
Step 50: 36995 + 755 = 37750
Step 51: 37750 + 755 = 38505
Step 52: 38505 + 755 = 39260
Step 53: 39260 + 755 = 40015
Step 54: 40015 + 755 = 40770
Step 55: 40770 + 755 = 41525
Step 56: 41525 + 755 = 42280
Step 57: 42280 + 755 = 43035
Step 58: 43035 + 755 = 43790
Step 59: 43790 + 755 = 44545
Step 60: 44545 + 755 = 45300
Step 61: 45300 + 755 = 46055
Step 62: 46055 + 755 = 46810
Step 63: 46810 + 755 = 47565
Step 64: 47565 + 755 = 48320
Step 65: 48320 + 755 = 49075
Step 66: 49075 + 755 = 49830
Step 67: 49830 + 755 = 50585
Step 68: 50585 + 755 = 51340
Step 69: 51340 + 755 = 52095
Step 70: 52095 + 755 = 52850
Step 71: 52850 + 755 = 53605
Step 72: 53605 + 755 = 54360
Step 73: 54360 + 755 = 55115
Step 74: 55115 + 755 = 55870
Step 75: 55870 + 755 = 56625
Step 76: 56625 + 755 = 57380
Step 77: 57380 + 755 = 58135
Step 78: 58135 + 755 = 58890
Step 79: 58890 + 755 = 59645
Step 80: 59645 + 755 = 60400
Step 81: 60400 + 755 = 61155
Step 82: 61155 + 755 = 61910
Step 83: 61910 + 755 = 62665
Step 84: 62665 + 755 = 63420
Step 85: 63420 + 755 = 64175
Step 86: 64175 + 755 = 64930
Step 87: 64930 + 755 = 65685
Step 88: 65685 + 755 = 66440
Step 89: 66440 + 755 = 67195
Step 90: 67195 + 755 = 67950
Step 91: 67950 + 755 = 68705
Step 92: 68705 + 755 = 69460
Step 93: 69460 + 755 = 70215
Step 94: 70215 + 755 = 70970
Step 95: 70970 + 755 = 71725
Step 96: 71725 + 755 = 72480
Step 97: 72480 + 755 = 73235
Step 98: 73235 + 755 = 73990
Step 99: 73990 + 755 = 74745
Step 100: 74745 + 755 = 75500
Step 101: 75500 + 755 = 76255
Step 102: 76255 + 755 = 77010
Step 103: 77010 + 755 = 77765
Step 104: 77765 + 755 = 78520
Step 105: 78520 + 755 = 79275
Step 106: 79275 + 755 = 80030
Step 107: 80030 + 755 = 80785
Step 108: 80785 + 755 = 81540
Step 109: 81540 + 755 = 82295
Step 110: 82295 + 755 = 83050
Step 111: 83050 + 755 = 83805
Step 112: 83805 + 755 = 84560
Step 113: 84560 + 755 = 85315
Step 114: 85315 + 755 = 86070
Step 115: 86070 + 755 = 86825
Step 116: 86825 + 755 = 87580
Step 117: 87580 + 755 = 88335
Step 118: 88335 + 755 = 89090
Step 119: 89090 + 755 = 89845
Step 120: 89845 + 755 = 90600
Step 121: 90600 + 755 = 91355
Step 122: 91355 + 755 = 92110
Step 123: 92110 + 755 = 92865
Step 124: 92865 + 755 = 93620
Step 125: 93620 + 755 = 94375
Step 126: 94375 + 755 = 95130
Step 127: 95130 + 755 = 95885
Step 128: 95885 + 755 = 96640
Step 129: 96640 + 755 = 97395
Step 130: 97395 + 755 = 98150
Step 131: 98150 + 755 = 98905
Step 132: 98905 + 755 = 99660
Step 133: 99660 + 755 = 100415
Step 134: 100415 + 755 = 101170
Step 135: 101170 + 755 = 101925
Step 136: 101925 + 755 = 102680
Step 137: 102680 + 755 = 103435
Step 138: 103435 + 755 = 104190
Step 139: 104190 + 755 = 104945
Step 140: 104945 + 755 = 105700
Step 141: 105700 + 755 = 106455
Step 142: 106455 + 755 = 107210
Step 143: 107210 + 755 = 107965
Step 144: 107965 + 755 = 108720
Step 145: 108720 + 755 = 109475
Step 146: 109475 + 755 = 110230
Step 147: 110230 + 755 = 110985
Step 148: 110985 + 755 = 111740
Step 149: 111740 + 755 = 112495
Step 150: 112495 + 755 = 113250
Step 151: 113250 + 755 = 114005
Step 152: 114005 + 755 = 114760
Step 153: 114760 + 755 = 115515
Step 154: 115515 + 755 = 116270
Step 155: 116270 + 755 = 117025
Step 156: 117025 + 755 = 117780
Step 157: 117780 + 755 = 118535
Step 158: 118535 + 755 = 119290
Step 159: 119290 + 755 = 120045
Step 160: 120045 + 755 = 120800
Step 161: 120800 + 755 = 121555
Step 162: 121555 + 755 = 122310
Step 163: 122310 + 755 = 123065
Step 164: 123065 + 755 = 123820
Step 165: 123820 + 755 = 124575
Step 166: 124575 + 755 = 125330
Step 167: 125330 + 755 = 126085
Step 168: 126085 + 755 = 126840
Step 169: 126840 + 755 = 127595
Step 170: 127595 + 755 = 128350
Step 171: 128350 + 755 = 129105
Step 172: 129105 + 755 = 129860
Step 173: 129860 + 755 = 130615
Step 174: 130615 + 755 = 131370
Step 175: 131370 + 755 = 132125
Step 176: 132125 + 755 = 132880
Step 177: 132880 + 755 = 133635
Step 178: 133635 + 755 = 134390
Step 179: 134390 + 755 = 135145
Step 180: 135145 + 755 = 135900
Step 181: 135900 + 755 = 136655
Step 182: 136655 + 755 = 137410
Step 183: 137410 + 755 = 138165
Step 184: 138165 + 755 = 138920
Step 185: 138920 + 755 = 139675
Step 186: 139675 + 755 = 140430
Step 187: 140430 + 755 = 141185
Step 188: 141185 + 755 = 141940
Step 189: 141940 + 755 = 142695
Step 190: 142695 + 755 = 143450
Step 191: 143450 + 755 = 144205
Step 192: 144205 + 755 = 144960
Step 193: 144960 + 755 = 145715
Step 194: 145715 + 755 = 146470
Step 195: 146470 + 755 = 147225
Step 196: 147225 + 755 = 147980
Step 197: 147980 + 755 = 148735
Step 198: 148735 + 755 = 149490
Step 199: 149490 + 755 = 150245
Step 200: 150245 + 755 = 151000
Step 201: 151000 + 755 = 151755
Step 202: 151755 + 755 = 152510
Step 203: 152510 + 755 = 153265
Step 204: 153265 + 755 = 154020
Step 205: 154020 + 755 = 154775
Step 206: 154775 + 755 = 155530
Step 207: 155530 + 755 = 156285
Step 208: 156285 + 755 = 157040
Step 209: 157040 + 755 = 157795
Step 210: 157795 + 755 = 158550
Step 211: 158550 + 755 = 159305
Step 212: 159305 + 755 = 160060
Step 213: 160060 + 755 = 160815
Step 214: 160815 + 755 = 161570
Step 215: 161570 + 755 = 162325
Step 216: 162325 + 755 = 163080
Step 217: 163080 + 755 = 163835
Step 218: 163835 + 755 = 164590
Step 219: 164590 + 755 = 165345
Step 220: 165345 + 755 = 166100
Step 221: 166100 + 755 = 166855
Step 222: 166855 + 755 = 167610
Step 223: 167610 + 755 = 168365
Step 224: 168365 + 755 = 169120
Step 225: 169120 + 755 = 169875
Step 226: 169875 + 755 = 170630
Step 227: 170630 + 755 = 171385
Step 228: 171385 + 755 = 172140
Step 229: 172140 + 755 = 172895
Step 230: 172895 + 755 = 173650
Step 231: 173650 + 755 = 174405
Step 232: 174405 + 755 = 175160
Step 233: 175160 + 755 = 175915
Step 234: 175915 + 755 = 176670
Step 235: 176670 + 755 = 177425
Step 236: 177425 + 755 = 178180
Step 237: 178180 + 755 = 178935
Step 238: 178935 + 755 = 179690
Step 239: 179690 + 755 = 180445
Step 240: 180445 + 755 = 181200
Step 241: 181200 + 755 = 181955
Step 242: 181955 + 755 = 182710
Step 243: 182710 + 755 = 183465
Step 244: 183465 + 755 = 184220
Step 245: 184220 + 755 = 184975
Step 246: 184975 + 755 = 185730
Step 247: 185730 + 755 = 186485
Step 248: 186485 + 755 = 187240
Step 249: 187240 + 755 = 187995
Step 250: 187995 + 755 = 188750
Step 251: 188750 + 755 = 189505
Step 252: 189505 + 755 = 190260
Step 253: 190260 + 755 = 191015
Step 254: 191015 + 755 = 191770
Step 255: 191770 + 755 = 192525
Step 256: 192525 + 755 = 193280
Step 257: 193280 + 755 = 194035
Step 258: 194035 + 755 = 194790
Step 259: 194790 + 755 = 195545
Step 260: 195545 + 755 = 196300
Step 261: 196300 + 755 = 197055
Step 262: 197055 + 755 = 197810
Step 263: 197810 + 755 = 198565
Step 264: 198565 + 755 = 199320
Step 265: 199320 + 755 = 200075
Step 266: 200075 + 755 = 200830
Step 267: 200830 + 755 = 201585
Step 268: 201585 + 755 = 202340
Step 269: 202340 + 755 = 203095
Step 270: 203095 + 755 = 203850
Step 271: 203850 + 755 = 204605
Step 272: 204605 + 755 = 205360
Step 273: 205360 + 755 = 206115
Step 274: 206115 + 755 = 206870
Step 275: 206870 + 755 = 207625
Step 276: 207625 + 755 = 208380
Step 277: 208380 + 755 = 209135
Step 278: 209135 + 755 = 209890
Step 279: 209890 + 755 = 210645
Step 280: 210645 + 755 = 211400
Step 281: 211400 + 755 = 212155
Step 282: 212155 + 755 = 212910
Step 283: 212910 + 755 = 213665
Step 284: 213665 + 755 = 214420
Step 285: 214420 + 755 = 215175
Step 286: 215175 + 755 = 215930
Step 287: 215930 + 755 = 216685
Step 288: 216685 + 755 = 217440
Step 289: 217440 + 755 = 218195
Step 290: 218195 + 755 = 218950
Step 291: 218950 + 755 = 219705
Step 292: 219705 + 755 = 220460
Step 293: 220460 + 755 = 221215
Step 294: 221215 + 755 = 221970
Step 295: 221970 + 755 = 222725
Step 296: 222725 + 755 = 223480
Step 297: 223480 + 755 = 224235
Step 298: 224235 + 755 = 224990
Step 299: 224990 + 755 = 225745
Step 300: 225745 + 755 = 226500
Step 301: 226500 + 755 = 227255
Step 302: 227255 + 755 = 228010
Step 303: 228010 + 755 = 228765
Step 304: 228765 + 755 = 229520
Step 305: 229520 + 755 = 230275
Step 306: 230275 + 755 = 231030
Step 307: 231030 + 755 = 231785
Step 308: 231785 + 755 = 232540
Step 309: 232540 + 755 = 233295
Step 310: 233295 + 755 = 234050
Step 311: 234050 + 755 = 234805
Step 312: 234805 + 755 = 235560
Step 313: 235560 + 755 = 236315
Step 314: 236315 + 755 = 237070
Step 315: 237070 + 755 = 237825
Step 316: 237825 + 755 = 238580
Step 317: 238580 + 755 = 239335
Step 318: 239335 + 755 = 240090
Step 319: 240090 + 755 = 240845
Step 320: 240845 + 755 = 241600
Step 321: 241600 + 755 = 242355
Step 322: 242355 + 755 = 243110
Step 323: 243110 + 755 = 243865
Step 324: 243865 + 755 = 244620
Step 325: 244620 + 755 = 245375
Step 326: 245375 + 755 = 246130
Step 327: 246130 + 755 = 246885
Step 328: 246885 + 755 = 247640
Step 329: 247640 + 755 = 248395
Step 330: 248395 + 755 = 249150
Step 331: 249150 + 755 = 249905
Step 332: 249905 + 755 = 250660
Step 333: 250660 + 755 = 251415
Step 334: 251415 + 755 = 252170
Step 335: 252170 + 755 = 252925
Step 336: 252925 + 755 = 253680
Step 337: 253680 + 755 = 254435
Step 338: 254435 + 755 = 255190
Step 339: 255190 + 755 = 255945
Step 340: 255945 + 755 = 256700
Step 341: 256700 + 755 = 257455
Step 342: 257455 + 755 = 258210
Step 343: 258210 + 755 = 258965

So, 755*343 = 258965